linux-kernel - Re: [PATCH v20 0/7] Virtio-balloon Enhancement

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Message-ID: <20171219144020.GA30842@bombadil.infradead.org>
Date:   Tue, 19 Dec 2017 06:40:20 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     wei.w.wang@...el.com, virtio-dev@...ts.oasis-open.org,
        linux-kernel@...r.kernel.org, qemu-devel@...gnu.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, mst@...hat.com, mhocko@...nel.org,
        akpm@...ux-foundation.org, mawilcox@...rosoft.com,
        david@...hat.com, cornelia.huck@...ibm.com,
        mgorman@...hsingularity.net, aarcange@...hat.com,
        amit.shah@...hat.com, pbonzini@...hat.com,
        liliang.opensource@...il.com, yang.zhang.wz@...il.com,
        quan.xu0@...il.com, nilal@...hat.com, riel@...hat.com
Subject: Re: [PATCH v20 0/7] Virtio-balloon Enhancement

On Tue, Dec 19, 2017 at 11:05:11PM +0900, Tetsuo Handa wrote:
> Removing exceptional path made this patch easier to read.
> But what I meant is
> 
>   Can you eliminate exception path and fold all xbitmap patches into one, and
>   post only one xbitmap patch without virtio-balloon changes? 
> 
> .
> 
> I still think we don't need xb_preload()/xb_preload_end().
> I think xb_find_set() has a bug in !node path.

Don't think.  Write a test-case.  Please.  If it shows a bug, then great,
Wei has an example of what the bug is to fix.  If it doesn't show a bug,
then we can add it to the test suite anyway, to ensure that case continues
to work in the future.

> Also, please avoid unconditionally adding to builtin modules.
> There are users who want to save even few KB.
> 
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